一個基于孔洞演化機制的韌性斷裂預測模型

穆磊; 臧勇; Araujo Stemler Pedro Malaquias

doi:10.13374/j.issn2095-9389.2017.04.011

一個基于孔洞演化機制的韌性斷裂預測模型

doi: 10.13374/j.issn2095-9389.2017.04.011

1) 北京科技大學機械工程學院, 北京 100083
2) 美國俄亥俄州立大學精密成形中心, 哥倫布 43210

詳細信息

中圖分類號: TG113.25
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- 文章訪問數: 561
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出版歷程
- 收稿日期: 2016-12-25

A micromechanically motivated uncoupled model for ductile fracture prediction

1) School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
2) Center for Precision Forming, the Ohio State University, Columbus 43210, USA

摘要

摘要: 在韌性斷裂中微觀孔洞演化機制的基礎上,提出了一個基于孔洞演化機制的非耦合型韌性斷裂預測模型.模型充分考慮了兩種典型的孔洞演化機制:孔洞的長大機制和孔洞的拉長扭轉機制.該模型引入了三個具有不同物理意義的材料參數:材料對不同孔洞演化機制的敏感度、應力狀態敏感度系數和材料的損傷閾值,并使用等效塑性應變增量表征其對韌性損傷累積過程的驅動作用.為了使模型可以更好地反映三維應力狀態對材料韌性斷裂性能的影響,將該模型從主應力空間轉換到由應力三軸度、羅德參數和臨界斷裂應變構成的三維空間,得到了由模型確定的三維韌性斷裂曲面,并研究了相關參數對三維韌性斷裂曲面及平面應力二維韌性斷裂曲線的影響.利用5083-O鋁合金、TRIP690鋼和Docol 600DL雙相鋼三個典型的輕質高強板材的韌性斷裂數據驗證了該模型對不同材料和不同應力狀態的適用性和準確性.
- 韌性斷裂 /
- 非耦合 /
- 應力三軸度 /
- 羅德參數 /
- 孔洞演化
Abstract: This paper is a contribution to the ductile fracture prediction by the proposal of a new uncoupled ductile fracture criterion. In the new criterion, two typical void deformation models were carefully considered, with the plastic strain increment regarded as a key impetus of the damage evolution and its accumulation. The new ductile fracture criterion was constructed with three model parameters with different physical meanings. A 3D ductile fracture surface model was obtained by transforming the proposed criterion from stress space to the space of stress triaxiality, Lode parameter, and fracture strain, and a parametric study was carried out to better understand their effects. To validate the performance of the new criterion, it was used to construct the 3D fracture surfaces of 5083-O aluminum alloy, TRIP690, and Docol 600DL (a dual-phase steel). Comparisons of the results with experimental observations indicate that the proposed criterion provides good prediction capability over a large range of stress states for various materials, with good flexibility and considerable accuracy.
- ductile fracture /
- uncoupled /
- stress triaxiality /
- Lode parameter /
- void evolution

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